| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-performance switching-type current limiter, employing a maintenance free permanent magnet. SOLUTION: The current limiter comprises a closed magnetic circuit, comprising two permanent magnets 1-1 and 1-2 and two soft cores 2-1 and 2-2, disposed opposite so as to sandwich the permanent magnets 1-1 and 1-2, with two short circuit coils 4-1 and 4-2 connected in reverse series, while being wound to surround different soft cores having opposite direction of magnetization along the longitudinal direction of each soft core under magnetic saturation state, where static flux generated from the permanent magnets circulates; and one conduction coil 3 connected with a power supply and a load, while being wound so as to surround two cores collectively, where a current, flowing through the conduction coil when a circuit connected with the conduction coil is shorted, is limited utilizing switching phenomenon where magnetization of each core is inverted by each half period by a field generated in the closed magnetic circuit by that current.
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